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9. State and explain Avogadro's law. Explain howatom of an element is distinguished frommolecule? |
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Answer» This is a statement that, under the same conditions of temperature and pressure, equal volumes of different gases contain an equal number of molecules (called Avogadro's number). First proposed by the Italian scientist Amedeo Avogadro (1776 - 1856) in 1811, it became accepted c. 1860. From the law, it follows that the volume occupied by one mole of gas (at standard conditions of 32 °F [0 °C] and 1 atmosphere of pressure) is the same for all gases (0.791 cubic feet [22.4 litres]). Atoms are indivisible particles that cannot be destroyed or created by any chemical changes. Two or more than two atoms of same elements or different elements combine to form a molecule. If atoms of same elements combine, they give rise to the formation of a molecule of an element. If atoms of different elements combine, a molecule of compound is formed. Ans |
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